Development and implementation of the treatment control system in Shanghai Proton Therapy Facility

Transcription

1 Development and implementation of the treatment control system in Shanghai Proton Therapy Facility Ming Liu Electronics Group, Division of Beam Diagnostics & Control Technology Shanghai Synchrotron Radiation Facility

2 Outline System structure Hardware modules System implementation

3 Shanghai Proton Therapy Facility Ruijing Hospital North

4 System structure Irradiation control sub-system Execute the irradiation procedure Verify treatment parameters Treatment interlock sub-system Enable / inhibit treatment relevant equipment and devices Send / receive interlock signals to / from MPS Nozzle Electronic Devices (NED) NED-A: primary dose collector NED-B: secondary dose collector NED-C: position data collector NED-D: scanning magnet field data collector NED-E: snout motion control module NED-F: treatment head interlock module

5 System structure irradiation control The structure of irradiation control sub-system was simplified by separating critical data processing and non-critical data transfer. Critical data processing (beam operation) Dose, position, scanning magnet field, beam on/off, scanning magnet PS etc. By hardware (FPGA, hardwire, optical fiber) In real time Non-critical data transfering Accelerator parameters By EPICS & Ethernet In non-real time Timing system Beam Diagnose Irradiation controller Treatment interlock system Irradiation Monitor Irradiation control panel C P U C P U Treatment network Accelerator network VME chassis NED-A NED-E NED-D Scanning PS NED-B NED-C

6 System structure treatment interlock Each treatment room has its own interlock sub-system Guarantee personal safety and machine safety in treatment room; All by hardware

7 System structure NEDs Module NED-A NED-B NED-C NED-D NED-E NED-F Description Receive data from main-dose monitor including dose, ambient parameters in the monitor, high-voltage readback. Receive data from sub-dose monitor including dose and high-voltage readback; Send high-voltage interlock signals to dose monitors and position monitors. Receive data from position monitors including position data and high-voltage readback. Receive data from hall sensors in the scanning magnet field. Send snout movement orders and receive snout position data. Process local input/output interlock signals in nozzle.

8 Irradiation controller & irradiation monitor Both of irradiation controller and irradiation monitor are event timing module EVO designed by ourselves. Control timing sequence by interconnect timing network in uplink port; Receive data from NEDs and send commands to NEDs by peer-topeer fiber connection in 8 downlink ports; Process data and do calculation in FPGA; Send accelerator parameters and receive accelerator readback status by EPICS & Ethernet; Control scanning PS through transition board by plastic fibers; Interconnect treatment interlock sub-system through transition board by plastic fibers; Interconnect irradiation control panel through transition board by plastic fibers.

9 Treatment interlock sub-system Co-design with Cosylab; Compatible with cpci 3U mechanical standard; Customized backplane bus definition; Embedded IOC in the mounted XportPRO; Full hardware implementation. Module Description MIS-MON Monitor and controller of the interlock chassis MIS-ITL Interlock logic calculation MIS-INE 8 electric inputs MIS-INE MIS-INO MIS-INO 4 optic(2412) inputs MIS-INR 8 relay inputs MIS-OTE MIS-OTO 8 electric outputs 4 optic(1414) outputs MIS-MON MIS-OTE MIS-OTO MIS-OTR 8 relay outputs

10 Nozzle electric devices (NED) Standalone modules installed in nozzle; Each NED carries 3 modules with IP mechanical standard; Radiation hardened FPGA; SFP sends and receives data;

11 System implementation The irradiation controller and irradiation monitor are integrated into the main timing system, and send events to upstream EVG to turn ON/OFF the beam in real time. High level therapy software Treatment network Accelerator network The transmission of treatment data is through the treatment network.(epics/ethernet) ACS Timing chassis MPS TCS chassis TCS chassis The transmission of accelerator parameters is through the accelerator network.(epics/ethernet) Accelerator Device

12 System implementation Accelerating sequences triggered by irradiation controller triggered by timing system T 0 : Initialization begins. Irradiation controller sends parameters for 1 st layer. T 1 : Ramping begins. T 2 : Ramping stops. Expected energy achieved. T 3 : Irradiation controller reads and verifies the status of accelerator. RF-KO turns ON and OFF to execute spot scanning. T 4 : Irradiation controller sends parameters for the next layer. T 5 : Accelerator continues to go on ramping and then starts deceleration at the highest energy.

13 System implementation Software Treatment room switching Up layer software sends room-switching command; Accelerator part EVG MPS Treatment part MPS selects corresponding channel in transition boards of FOUT through hardwire; FOUT EVO EVO EVO FOUT FOUT Irradiation controller 1 Irradiation monitor 1 FOUT receives the timing sequence only from the irradiation controller & monitor of the selected room. Irradiation controller 2 Irradiation monitor 2 Irradiation controller 3 Irradiation monitor 3

14 System implementation Multi-redundant safety interlock mechanism Initiator irradiation controller irradiation monitor irradiation control panel Executive devices RFKO Beam abort system (steering magnet) MPS Beam stopper

15 Recent progress

16 THANKS.